白云石化

The authors studied the distri-bution of dolomitization and textures and structures of the rocks, analyzed tra...

最后通过实例说明了研究礁岩埋藏白云石化作用对油气、铅锌矿产勘探的实用意义。

Based on the strontium concentration,isotope composition of the dolomites,the dolomitization fluids were accordingly inferred here.

根据白云岩的锶舍量和锶同位素组成，结合相关岩石学和地球化学资料，本文研究了白云石化过程中锶的迁移和相应的同位素变化。

The replacement process of dolomitization is a volume replacement for volume, not a mole for mole.

白云岩储层中的孔隙是各种溶蚀孔而非白云石化等摩尔交代的体积收缩孔。

Secondary porosity is the additional porosity created by subsequent chemical changes, especially fissures, fractures, solution vugs, and porosity created by dolomitization.

次生孔隙度则是由后生化学变化，特别是裂隙，断裂，溶洞和白云石化作用而产生的附加孔隙度。

Trontium isotope test analysis indicates that relationship exists between~(87)Sr/~(86)Sr ratios and the variation of seawater, evolution of palaeo-geographicalconditions in the region of Tazhong is the direct factor which controls the change ofthe 87Sr / 86Sr ratios and dolomitization is also an important factor.

r同位素测试分析表明，~(87)Sr/~(86)Sr比值与海水变化有关，塔中地区古地理环境演化是~(87)Sr/~(86)Sr比值变化的直接控制因素，白云石化作用对~(87)Sr/~(86)Sr比值有着重要作用。

In this deposit, ore bodies exist in the stratoid form and are c ontrolled by thrust faults. The host rocks are limestone in Bolila Formation of Late Triassic Jiezha Group and in Gadikao Formation of Early-Middle Permian Kaix i nling Group, with strong dolomitization and weak silicification. Minerals are ra ther simple and consist of sphalerite, galena, pyrite, calcite, dolomite and barite. The important ore textures are colloforms such as framboid and crust and xenom orphic grains, and the ore structures are in disseminated, brecciated, veinlike and lumpy forms.

东莫扎抓铅锌矿床矿体呈似层状展布，产状严格受到矿区逆冲断层的控制，赋矿围岩为上三叠统结扎群波里拉组灰岩和下-中二叠统开心岭群尕迪考组灰岩，发育强白云石化和弱硅化，矿物组合简单，主要为闪锌矿+方铅矿+黄铁矿+白云石+方解石+重晶石，矿石结构以皮壳状、草莓状等胶状结构和他形粒状结构为主，矿石构造为浸染状、角砾状、团块状和脉状。

A Late Permian Changxingian coral reef was recently discovered in Cili, Hunan Province, South China.

笔者对近期在湖南慈利发现的长兴期珊瑚礁的白云石化作用及成岩环境进行了研究。

The mixed water dolomization is mainly controlled by frequent change of the sea level.

总结了该储层发生混合水白云石化作用的模式

Mixed water dolomization is the basis of platform fringing oolitic beach reservoir of Feixianguan group.

残余鲕粒白云岩是飞仙关组鲕滩气藏最有利的储层。白云石化作用是有效储层形成的关键因素之一。

The three types of dolomite have similar strontium content with higher ~(87)Sr/~(86)Sr ratios to some extent than that of the coeval seawater.The difterenee of distribution coefficient of Sr in calciteand dolomite is the most important control factor on the strontium content in dolomites.

三种类型白云岩具有类似的锶含量，但其(87)~Sr/(86)~Sr 比值均不同程度地高于同期海水值，锶在白云石和方解石中分配系数的差别是影响白云石化过程中白云石锶含量最为重要的因素。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。